Device for eliminating valve noises from overhead valve motors



Mar. 13, 1923. 1,448,687

A. C. ENNIS DEVICE FOR ELIMINATINQVALVE NOISES FROM OVERHEAD VALVEMOTORS Original Fileq Apr. 7. 1921 T53. IKE-E v amvemtoz a: Elf/222 2L5Patented an. 13, 1923.

ANDREW C. ENNIS, OF MOUNT OLIVE, NORTH CAROLINA.

DEVICE FOR ELIMINATI IING' VALVE NOISES FROM OVERHEAD VALVE MOTORS.

Original application filed April 7, 1921, Serial 110.45%),422. Dividedand this application filed August 11,

Serial H0. 491,546.

- tain new and useful Improvements in Devices for Eliminating ValveNoises from Overhead Valve Motors; and I do declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

This invention relates to an improved device for eliminating valvenoises from a motor having overhead valves operated from a cam shaft bymeans of rocker arms and push rods. One object of the invention is toprovide a device for eliminating noises at the upper ends of the pushrods and to prevent loss motion between the rocker arms and push rodswhen the motoris in opera-- tion. 1

Another object of the invention is to So construct the attachmentreferred to that they may be used in connection with push rods of aconventional construction and thus applied to motors already in usewithout making any change in the specific con struction of the push rodsof the motor.

Another object of the invention is to provide a mechanism of thecharacter described which will be simple in construction and easy-t0apply and further so constructed that it will be very effective inoperation and not liable to get out of place when in use.

This invention is illustrated in the accompanying drawings, wherein:

Figure 1 is a vertical sectional view through a motor provided with theimproved silencing mechanism.

Figure 2 is a fragmentary view showing in elevation a rocker arm and theupper end portion of a push rod with the improved silencing deviceapplied to the push rod.

Figure 3 is an enlarged sectional view through the silencing device withthe upper end-portion of the push rod shown in elevation.

This device is used in connection with an internal combustion motorwhich is of a conventional construction. This motor is indicated ingeneral by the numeral 1 and is rovided with a cam shaft 2 and suitableva ves, one of which is indicated by the numeral 3. This valve isprovided with a stem 4 which extends upwardly through the upper end ofthe motor and carries an abutment 5 engaged by a spring 6 so that thevalve will beyieldably held in a closed position and the upper end ofthe stem held in engagement with a rocker arm 7 pivotally mounted upon astandard 8, This rocker arm extends outwardly and is positioned abovethe upper end of the push rod or lifting rod 9 which is slidably mountedin a bearing 10 and has its lower end operatively engaging a plunger 11and held against rotary movement independent of the plunger by aconventional clamp 12. This clamp 12 operates in the usual manner toprevent the plunger and push rod from having rotary movement andtherefore the plunger will at all times be retained in'proper engagementwiththe cam 13 carried by the shaft 2 and as the shaft 2 rotates, theplunger and push rod will be moved vertically. A device which isindicated in general by the numeral 14 and is specifically described inmy co-pending application, filed April 7, 1921, Serial Number 459,422has been provided so that the push rods will be prevented from havingmovement transversely of the plunger and therefore noise at this pointwill be prevented when the motor is in operation.

In order to permit the outer end portion of the rocker arm to be engagedwith a minimum amount of noise, there has been provided a casing 20which fits upon the upper end of the lifting rod and is provided with apartition 21 formed of fibre. A plunger 22 slidably fits into thetubular easing 2 above the partition and is provided with an enlargedinner or lower end portion 23 which will prevent the plunger from movingentirely out of the casing by striking against the inwardly extendingflange 24 at the upper end of the casing. A socket 25 is provided in theenlarged inner or lower end portion of this plunger to receive a spring26, the spring engaging the fibre partition 21 and yieldably holding theplunger in a raised position for engaging the outer end portion of therocker shaft. It will thus be seen that when the lifting rod 9 movesupwardly and strikes the outer end of the rocker arm. the force of theblow will be taken up by the plunger and the plunger will be moveddownwardly against the action of the spring. Therefore, the outer end ofthe rocker arm can be engaged and the rocker arm moved upon its pivotwithout appreciable noise.

l/Vhen applying this device for eliminating noises and taking up lossmotion between the push rod and rocker arm, it is simply necessary tovertically adjust the push rod or out off a portion of the upper endthereof and place the casing 20 upon the upper end of the push rod. Thespring 26 will hold the lunger in engagement with the outer end 0 therocker arm and therefore the rocker arm will at all times be engaged andnoise will not be caused by a push rod striking a rocker arm.

I claim:

A silencing attachmentfor the upper end of a valve lifting rodcomprising a sleeve for fitting upon a lifting rod, 2. plunger slidablymounted in the sleeve, a partition in the sleeve for engaging the upperend of the valve lifting rod, said partition being formed of cushioningmaterial, said plunger being positioned above the partition and having areduced end portion providing a shoulder, and having its lower endengage able with said partition and having its lower end portionprovided with a pocket open at its lower end, the upper end portion ofthe sleeve being inwardly thickened to provide an inwardly extendingflange tapered upwardly and limiting upward movement of the plungerthrough engagement of the shoulder thereof with said flange, and aspring in the pocket having its lower end engaging said partition'andyieldably holding the plunger in a raised position.

In testimony whereof I have hereunto set my hand.

ANDREW C. ENNIS.

